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Why did the check engine light come on when I was driving.?
How long has your 2008 Mercury Grand Marquis had this problem?
A few days
1 Reply
Hi - Dave here, contributing to RepairPal and providing expert advice since 2010. The check engine warning light will come on when it detects a fault that is affecting the efficiency of the engine - usually affecting the emission system. This can indicate a problem with ignition spark misfire, exhaust gas recirculation issues, fuel trim issues and evaporative emissions systems issues, to name a few categories of potential concern. Hands on diagnostic testing using a suitable Ford compatible diagnostic tool is needed. https://repairpal.com/auto-repair-near-me Click the link to find some shops near you who can help out!